ios - 如何执行 whereKey 以便查询距当前用户____公里远的帖子？

Question

var limitlocation = 5 as Double

if let usergeo = currentuser.objectForKey("location") as? PFGeoPoint {
    query.whereKey("location", 
          nearGeoPoint: usergeo, 
          withinKilometers: limitlocation) 
}

目前有此功能，但只能获取 5 公里以内的用户。我该如何使它距离 5 公里以上。

Answer 1

默认情况下，这种类型的查询仅允许您查询距离您正在查询的 geoPoint 100 英里以内的 geoPoint:https://www.parse.com/docs/ios/guide#geopoints-caveats .

您可以做的是过滤结果并删除 5 公里内的所有结果。

这就是 Objective-C 中的样子 - 你必须将其转换为 swift

NSMutalbeArray* mutableObjects = [[NSMutableArray alloc] init];
PFGeoPoint* userGeoPoint = user[@"geoPoint"];
for (PFObject* object in objects) {

    PFGeoPoint* objectGeoPoint = object[@"geoPoint"];
    CLLocation *locA = [[CLLocation alloc] initWithLatitude:userGeoPoint.latitude longitude:userGeoPoint.longitude];
    CLLocation *locB = [[CLLocation alloc] initWithLatitude:objectGeoPoint.latitude longitude:objectGeoPoint.longitude];
    CLLocationDistance distance = [locA distanceFromLocation:locB]; // Distance in meters
    if (distance >= 5000) {
        [mutableObjects add:object];
    }

}